.banner {
    width: 100%;
    min-height: calc(100vh - 50px);
    overflow: hidden;
    padding-top: 100px;
    display: flex;
}

.banner .page-nav {
    width: 15.6%;
}

.page-nav .nav-content {
    display: inline-block;
    margin-left: 38px;
    text-align: left;
}


.page-nav .list-group {
    padding-left: 0;
    margin-bottom: 20px;
}

.page-nav .list-group-item {
    position: relative;
    display: block;
    padding: 0;
    margin-bottom: -1px;
    background-color: #fff;
    border: 0;
}

.page-nav .list-group-item h4,
.page-nav .list-group-item h4>a {
    padding: 10px 0;
    font-size: 18px;
    color: #000;
    font-weight: bold;
    cursor: pointer;
}

.page-nav .cat2-list {
    display: none;
}

.page-nav .cat2-li {
    padding: 3px 0;
}

.page-nav .cat2-li,
.page-nav .cat2-li a {
    color: #000;
    font-size: 14px;
    line-height: 22px;
}

.page-nav .sidebar-refer {
    margin-top: 80px;
    margin-bottom: 50px;
}




.page-nav .sidebar-refer .list-group-item h4 a {
    padding: 8px 0;
    font-size: 12px;
    color: #000;
    font-weight: normal;
}

.sidebar-refer .list-group-item h4 {
    padding-left: 12px;
    position: relative;
    font-weight: normal;
    font-size: 12px;
}

.sidebar-refer .cat2-li,
.sidebar-refer .cat2-li a {
    color: #333;
    font-size: 12px;
    padding-left: 10px;
}

